Mixing bowl fastener



' attachment between ing structure.

Patented Jan. 16, 1940 WPATENT yol-Flcla MIXING BOWL FASTENER cui kunnen, Berlin-Charlottenburg,

to Westinghouse Electric & Manuassignor Germany,

facturing Company, East Pittsburgh, Pa., a

vania corporation of Pennsyl Application July 17, 1937, Serial No. 154.322

Gemany'July 18, 1936 My invention relates to food mixers and the like, and more particularly to the method of attaching mixing bowls or the like to a supporting base therefor.

With those methods of attaching a vessel to A a supporting base known to the prior art, such vessels have either been set too loosely on the correspondingly lformed-base or the vessel has been manually fastened with special screws, bolts or levers and cams, etc. By using a correspondingly formed base to support a vessel, diiculties and delays have been encountered in properly v setting the vessel on and removing it from such supporting device. On the other ha'nd, in fastening a vessel to a supporting base with manually operated attaching devices, it has been necessary to either leave a portion of s uch device extend outside the supporting base, resulting in an inartistic structure, or in the case of supporting devices totally enclosed within the supporting structure. it has been necessary to tilt the structure in order to attach the vessel upon such support. It is, therefore, an object of my invention to, provide an automatlcallyoperated device which will make possible a rapid and` readily removable A the vessel and the support- A further object of my invention is to provide a latching device between the vessel and supporting device therefor which will be totally enclosed within the supporting structure.

A further object of my invention is to provide means whereby a vessel may be resiliently mounted upon and rigidly attached to a supporting structure.

I Other objectsof my invention will either be pointed out speciiically in the course of the following description of a device embodying my invention, or will be apparent from such description. v

In the accompanying sheet of drawing,

Figure 1 representsa partial sectional view of a device embodying my invention Fig. 2 is a sectional view taken along line lI-II of mg- 1; 1 A

` Fig. 3 is a sectional view taken along line Fig. 4 is an enlarged perspective view of a half portion of the device shown in Fig. 1; and

Fig. 5 is a partial` sectional view of a modiiied form of device embddying my invention.

Referring to the accompanying drawing, I show a vessel Il removably attached to a supporting base I2 by means of a latching device II.

points substantially midway between the notched apertiues 20. The side walls of the notched ap- The vessel I I, which may be of any suitable shape or size desired,` has a double bottom structure, as indicated by the reference character It. The inner or upper portion I6 of the bottom structure Il of the vessel is upwardly bulged at the central portion thereof a suitable 4amount to permit the ready access of the latching device I3 thereto. The lower bottom portion II may be rigidly attached to the vessel II in any suitable manner and is preferably substantially iiat. n m

An irregularly shaped aperture I8 is located substantially at the center of thexlower bottom portion I'I. The irregularly shaped aperture It is formed by a substantially circular aperture I9 in the central portion thereof and a pair of oppositely disposed notched apertures extending radially therefrom. A pair of semi-circular radial niches -2l are cut within the top surface of the lower bottom portion I'I at oppositely disposed ertures20 are 'tapered upwardly from approximately the bottom surface of the bottom portion I1 to a'point substantially two-thirds the distance between'such notched aperture and the circular niche 2|, substantially as indicated in Fig. 4 by the reference characters 22, there being four of such-inclined surfaces.

- 'I'he latching device I3 may comprise an upwardly projecting bar 26 with a cross pin member 2'( located at substantially the top thereof and preferably integral therewith. The axisof the crosspin 21 is substantially at right angles to the vertical axis of the projecting bar 2B. The

lower end of the bar 26 has an irregularly shaped 35 shoulder 28, preferably integral therewith. It is preferred that the upper end of the upwardly projecting bar 26 extend above'the surface of the supporting base I2a distance such that the centerline of the cross-pin 21 will be disposed 40 above the top surface of the supporting base a distance equal to substantially one-half the thickness of the lower bottom plate I'I.

A suitable resilient device 29 is located between the supporting base I2 and the shoulder 28. as sh'own in Fig'. 1. It is to be understood that this resilient member 29 may be a coiled spring or any other suitable device'which will Vbias thebar. 28 downwardly. A U-shaped strap 30 is disposed about the bar 26 and shoulder 28 and has 60 a plurality of lips 3l located on the top portion thereof. The U-shaped member 30 may be rigidly attached to the supporting base I2 by means of the lips' 3l in any suitable manner. It is, therefore, obvious thatthe U-shaped member 20 65 jecting bar 26 and prevent such bar from being removed from the supporting structure I2 unless the member 30 is first removed.

When the vessel I I is placed upon the supporting base I2, the position thereof is so selectedA that the bar 26 will project within the irregularly shaped aperture I8 located in the lower bottom portion I1 and that simultaneously the cross pin 21 will proceed through the notched apertures 20. The cross pin 21 will then be substantially aligned with the tapered portion 22, and if the vessel II be rotated in either direction, the cross pin 21 will first ride upwardly upon the inclined portions 22 and will then drop Within the semi'- circular niches 2I.

Due to the downwardly biasing action of the resilient member 29, the bar 26 and operatively associated cross pin 21 will securely hold the vessel II upon the supporting base I2. To remove the vessel from the supporting base, it is merely .necessary to again rotate the vessel II in either direction to such an extent that the cross pin 21 will glide downwardly along the inclined surfaces 22 and out through the notched apertures 20, whereupon the vesselllmay readily be removed from the supporting structure.

If it be desired, the bar 26 may be rigidly attached to the supporting base I2 in any suitable manner, as shown in Fig. 5, and may have a re- 'silient member, such as a rubber cushion 32,

resting upon the supporting base I2 and about the bar 26. With the resilient member 32 being ofl suilicient thickness, such member will restrain the 'vertical movements of the vessel II and act as a cushion therefor when such vessel has'been placed over the bar 26. It is to be understood that the preferred thickness of the resilient member 32, in relation to the position of the cross pin 21 on the bar 26, is such that as the vessel II is placed thereon, with the lcross pin 21 located within the notched apertures 20, such cross pin will b e'substantially in line with the lower ends of tapered side surfaces 22 of the notched apertures. With the vessel located upon the resilient member 32 in such a manner, it is obvious that as the vessel I I is rotatedabout the bar 26 as an axis, the cross pin 21 as itslides upwardly along i the tapered surfaces 22, will pull the vessel il downwardly, and with a continued rotation of such vessel the cross-pin 21 will become operatively engaged with the niches 2l, and,vthere fore, firmly hold the vessel II upon the resilient member 32. Due to this coaction of the crosspin 21 with the bottom of the vessel I I, such vessel is rmly but yet resiliently mounted upon the supporting structure I2. With the vessel mounted upon-the supporting structure I2 in such a manner with thevcross pin 21 embedded within the niches 2I, it ls apparent that such vessel II will remain fixed until it hasI been rotated to a position wherein pin 21 is disposed in apertures 20, which will permit the vessel to be removed from the bar 26.

It is, therefore, obviousv that when using a device as hereinabove described for rigidly attaching a vessel upon a suitable cooperating supporting base, such vessel may be automatically attached thereto without the need of manually operating any part of the supporting structure or without tilting such structure to perform such manual, operation.

It is likewise obvious that with a device embodying my invention a vessel may be rapidly .and accurately attached to a suitable supporting device with either a rigid or a resilient connection.

Various further modifications may be made in the device embodying my invention, such as interchanging the illustrated automatic attach-Y ment parts between the bowl and the base, without departing from the spirit and scope thereof and I desire, therefore, that only such limitations shall be placed thereon as are imposed by the prior art and the appended claim.

I claim as my invention:

A fastener comprising an upper flat member,

a stationary support therefor, said member having an irregularly shaped aperture therein andsaid support housing a bar at all times projecting through it and said aperture, a lateral projection rnear the top of said bar above said aperture, and 

